Today, at work, some colleagues were talking about space and one mentioned "String theory" in a context that doesn't make any sense. I wanted to tell him he's an idiot, because he obviously doesn't know what String theory even is, yet along mentioning it casually. Of course I didn't, but second time he mentioned it I wanted to smash a chair on him. It's not a problem he doesn't know what String theory represents, it's his way of telling. Other colleague corrected him saying String theory isn't what he means it is, and they changed the subject. What I'm trying to say is, I really hate when people use expressions in a manner like they're experts and they really don't know shit. What grinds your gears?